Question

(i) What is the common feature of the electronic configurations of the elements at the end of period 2 and period 3?
(ii) If an element is in group 7 (or Group VIIA), is it likely to be metallic or non-metallic in character?
(iii) Supply the missing word from the words given in brackets.
If an element has one electron in its outermost energy level (shell), then it is likely to be ______ (metallic/non-metallic).

Answer 1

(i) A common feature of electronic configurations of elements at the end of periods 2 and 3 is that they possess same number of electrons in their valence shells which are completely filled.

(ii) Group 7 or VII A element is a halogen having non-metallic character.

(iii) If an element has one electron in its outermost energy level (shell), then it is likely to be metallic.